VERT / GREEN
No contamination history or indicators: retain site screening with the file.
Soil vapour intrusion into a home
Assess whether volatile contaminants in soil or groundwater can migrate into indoor air, separately from radon.
JAUNE / YELLOW
Risky former use, odours or known nearby contamination: develop a conceptual site model before conclusions.
ROUGE / RED
Do not conclude from a single sample; vapour-intrusion assessment relies on multiple lines of evidence.
Construction triage
What the professional checks
- Develop source-pathway-receptor conceptual model
- Design sampling and interpret multiple lines of evidence
Official sources
Sources checked: 2026-08-22. Confirm local rules and the applicable edition.
V15
Remaining system checks not to miss
V15 covers issues that can block a project, cause a loss or become expensive once concealed.
V34
Use, excavation and construction constraints
V34 connects use permits, soil, excavation, neighbouring structures and public-space logistics before hard-to-reverse work.